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Equation Icon  R+ − = F − 12haha + 12 ˆ∇aha, ˆ ˆ 1 Rab = Rab[ + ∇ (ahb) − 2hahb, ] R = r2 − 1ˆ∇2F + 3haˆ∇ F + 1F∇ˆah − F h h + ∇ˆ h ˆ∇ h ≡ r2S , ++ [ 2 2 a 2 a ]a a [c a] [c a] ++ R = r ∇ˆ F − Fh − 2h ˆ∇ h + ∇ˆ ˆ∇ h ≡ rS , (12 ) +a a a b [a b] b [a b] +a